Goto. In the end it's all about manipulation of the instruction pointer.
Loops as deduplication is a very specific subset of looping that is very popular in some languages and almost nonexistent in others. If you don't have destructuring and convenient list literals you might never ever see it in the wild.
But even the Java 7 version (iterating an ImmutableList.of multi-nested Maps.immutableEntry of new FunctionN) can be workable despite its hilarious amount of repeated type annotations, if you have learned to stop worrying and love the tooling. Stuff like typescript makes it a breeze, so much that one might occasionally forget that it's not the regular form of looping.
